Method to automatically regulate brightness of liquid crystal displays

Abstract

The present invention provides a method to automatically regulate brightness of liquid crystal displays (LCDs), which resolves the overload and easy fatigue of human eyes and poor image contrast due to high brightness of the conventional LCD. The present invention includes use of four parts, including an image brightness regulating unit, an image brightness ratio computation and output controlling unit, an ambient light detection and brightness adaptation regulating unit and an image gray level expanding unit. The image signals of an LCD are processed in such a manner to enable automatic control of optical flux of LCD TV by regulating the gray level of output images. Also, optical flux of LCD TV can be automatically controlled with the change of images and ambient light, thus alleviating overburdening of human eyes and improving the contrast and comfort of images for a better visual effect.

Description

RELATED U.S. APPLICATIONS[0001]Not applicable.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not applicable.REFERENCE TO MICROFICHE APPENDIX[0003]Not applicable.FIELD OF THE INVENTION[0004]The present invention relates generally to an automatic brightness regulation method for a liquid crystal display (LCD). More particularly, the invention comprises an image brightness regulating unit, an image brightness ratio computing and output controlling unit and an ambient light detection and brightness adaptation regulating unit as well as an image gray level expanding unit.BACKGROUND OF THE INVENTION[0005]Flat panel displays are a future-oriented trend for the display industry. In particular, the liquid crystal display (LCD) attracts more attention thanks to its thin-profile, lightweight, lower radiation, lower power consumption and higher resolution and brightness. LCDs are now widely used in various applications from PCs, commercial display panels to home theaters.[...

AI Technical Summary

Benefits of technology

[0016]The image brightness ratio computing and output controlling unit 20 applies the images only for statistical analysis of image brightness, rather than calculation of output images. Thus, it is possible to considerably simplify the circuit structure without any influence of the details of the output image. For example, maximum 6-bit statistical brightness is enough to process 8-bit original image signal, thereby saving both hardware resources and circuit cost. The image brightness ratio computing and output controlling unit 20 comprises the following units:

[0033]FIG. 5 is another preferred embodiment of the present invention. A memory unit 11 can be neglected in the image brightness regulating unit 10, while the brightness of a prior image is applied for regulation of image brightness, thereby saving the cost of a memory unit.

Problems solved by technology

Thus, a high-brightness LCD enables continuous zoom-in / out of a pupil, leading to easy fatigue of human eyes.

If the images often vary within the range of brightness ratio, the pupil of human eyes will zoom in or out with the brightness ratio, leading to easy fatigue of the eyes.

This is because the pupil cannot provide real-time zoom in / out and timely adjustment.

In the event of higher frequency of brightness and darkness, the human eyes cannot duly adjust the light quantity, thus leading to a sense of poor image contrast.

After that, there will be an immediate sense of poor vision as the pupil is still in a zoom-out state.

If the brightness of the LCD TV is not properly reduced, the higher brightness of images will dazzle.

Images